Those clients exist despite Signal Foundation, not because they encourage community development. They are doing everything they can to discourage third party app development.

That was your original claim. None of the sources you provided back up your original claim. We can talk about Google libraries or the delay in server side code if you want to go down that path, but that’s a completely different discussion. Why are you pivoting to other topics? Will you concede your original point or do you have evidence to back it up?